Mining apparatus



Oct; 22, 1946. L. E; SIMMONS MINING APPARATUS Original Filed Oct. 15, 1941 5 Sheets-Sheet 1' Simmas 4 mm.

NV g/WW.

i 1 V a? f:

0a. 22, 194s. I ;E, SI M NS" 4 2;4o9,so7

MINING APPARATUS Original Filed Oct. 15, 1941 3 Sheets-Sheet 2 35 64 2 emu? 63472412072? Oct. 22,1946. 7 MM NS 2,4093% MINING APPARATUS Original Filed Oct. 13, 1941 :5 Sheets-Sheet s I 292? II I I 3 395.36 36 4 36' Patented Oct. 22, 1946 MINING AIPARATUS -Leon E. Simmons, Claremont, N. H., assignor to Joy Manufacturing Company, a corporation of Pennsylvania Continuation of application Serial No. 414,722,

October 13, 1941.

This application December 23, 1943, Serial No. 515,440

9 Claims.

This invention relates to mining apparatus, and more particularly, but not exclusively, to improvements in a transport truck especially designed for use in transporting a coal mining machine from place to place about a coal mine.

This application is a continuation of my copending application Serial No. 414,722, filed October 13, 1941.

An object of the present invention is to provide an improved coal mining apparatus. Another object is to provide an improved coal mining apparatus having novel elevating means. Yet another object is to provide an improved transport truck for a coal mining machine. A further object is to provide an improved transport truck having novel means for elevating the machine-receivingguideway thereof. Yet another object is to provide an improved transport truck for a coal mining machine wherein the truck elevating means may be operated through elements of the mining machine. A still further object is to provide an improved truck elevating mechanism which may be operated through an element of the feeding means of a coal mining machine supported on the truck. A still further object is to provide a novel transport truck having improved elevating mechanism whereby a coal mining machine may be supported in a relatively low position during transport about the mine and which is adapted to effect elevation of the truck to enable unloading of th mining machine at either side of the truck.

Another object is to provide an improved mining machin transport truck of the tilting-swivel type wherein the machine-guiding-frame may be swung into positions at either side of the truck and may be tilted into engagement with the mine floor, to facilitate loading and unloading of the mining machine. Yet another object is to provide an improved elevating mechanism for the svwlvelled machine-receiving frame of a mining machine transport truck. Still another object is to provide an improved hydraulically operated elevating mechanism for a transport truck and having novel means for operating the elevating mechanism. How these and other objects are accomplished and the advantageous features of the invention, will be best understood from the following detailed description wherein a preferred and illustrative embodiment is set forth, reference for th purpose being had to the accompanying drawings, in which:

Fig. 1 is a plan view of a coal mining apparatus constructed in accordance with an illustrative embodiment of the invention.

Fig. 2 is a side elevationalview of thecoal min ing apparatus shown in Fig. 1.

Fig. 3 is an enlarged view in longitudinal vertical section taken substantially on line 3-3 of Fig. 1, and showing the liquid pump.

Fig. 4 is an enlarged cross sectional view taken substantially on line 44 of Fig. 1.

Fig. 5 is a View in longitudinal vertical section taken substantially on line 55 of Fig. '1, showing the truck in lowered position.

Fig. 6 is a view similar to Fig. 5, showing the truck in elevated position,

Fig. 7 is a horizontal sectional view, with parts shown in plan, taken substantially on line 1-1 of Fig. 5.

Fig. 8 is an enlarged detail View in side elevation illustrating a portion of the apparatus shown in Fig. 2.

Fig. 9 is a detail sectional View taken On line 99 of Fig. 8.

Fig. 10 is a diagrammatic View of the hydraulic system.

In this illustrative construction there is shown an improved transport truck, generally designated l, adapted to receive and transport a coal mining machine, generally designated 2 (shown in construction lines in Figs. 1 and 2). The transport truck is of the well known tilting-swivel type and is provided with novel hydraulically operated mechanism, generally designated 3, for elevating the tiltable and swivelled machine-receiving frame relative to the truck body, for a purpose to be later explained. The coal mining machine 2 may be of the same general type as that disclosed in Patent No. 2,131,178, granted September. 27, 1938, in which I am one of the inventors, although it will be obvious that the invention may be utilized with mining apparatus of various other types, if desired. 1

The mining machine disclosed herein is of a conventional flexibly fed, room and pillar, floor cutter type slidable on its own bottom over the floor of a mine during operation thereof and having a frame 4 from which a horizontal plane kerf cutter 5 projects forwardly lengthwise of the machine. The machine has feeding and controlling drums 6 and l on which feeding and controlling cables 8 and 9 are respectively Wound. The matruck I receives the coal mining machine 2 for transport, and, in this improved construction, the machine motor not only effects drive of the truck wheels topropel the mining apparatus, in the manner described in the patent, but also serves as a source of power for the hydraulic pump of the hydraulically operated elevating mechanism 3 of the truck, as hereinafter explained.

The improved transport truck I has a truck frame or body it mounted on traction wheels H adapted to travel along a mine trackway l2 laid on the floor of the mine. A horizontal turntable or swivelled plate I3 is mounted on a sub frame 3 to turn about a vertical pivot 14, and mounted on this swivelled frame i a machine-receivingand-guiding frame I5. The machine-receivingand-guiding frame is preferably composed of suitable angle irons connected by transverse plates, and provides parallel guideways along which the coal mining machine is slidable during loading of the machine onto the truck and unloading of the machine from the truck. The machine-receiving-and-guiding frame has a rearward portion l6 and a front portion l l which may serve as a ramp along which the machine moves during the loading and. unloading operations. This machine receiving-and-guiding frame is pivoted on a horizontal axis at i8 on the turntable, and has a front floor-engaging plate IQ for facilitating movement of the machine onto and from the truck. The rearward portion I5 of the machinereceiving-and-guiding frame has a transverse rear plate notched at 2| to receive a conventional hook or clevis on the free end of each of the cables 8 and 9, and suitable hooks 22 are provided at the opposite sides of the forward end of the swivelled machine-receiving-and-guiding frame, and the cable hooks or clevises are engageable in these notches 2i and connectible to these hooks 22 during certain of the machine loading or unloading operations, in a, well known manner.

Now referring to the improved elevating mechanism 3 for the machine-receiving-and-guiding frame I5 of the truck, it will be notedthat journaled to'rotate on the supporting axles 25 of the truck are frames 23 haVing lever arms 21 pivotally connected at 28 to depending lugs 29 integral with the sub frame [3' of the turntable i3. These lever arms 21, 2f are arranged to provide a parallel motion supporting structure for. the turntable, so. that when the arms are swung in unison about their pivots the machine-receivingand-guiding frame may be elevated into different parallel positions. When the machine-receivingand-guiding frame E15 is in its lowered position, as shown in Fig. 5, the bottom thereof is disposed below the'topsof the truck wheels between the latter, and when the machine-receiving-andguiding frame is in its elevated position its bottom is disposed above the truck wheels, so that itmay be swung horizontally into positions at either side of the truck. The frames 26, 26 have lever arms 3i and 3!, respectively, to which are pivotally connected the opposite ends of a hydraulic jack mechanism This jack mechanism. comprises a pair of hydraulic cylinders 33, 33 containing reciprocable pistons 34 having piston rods 35 projecting rcarwardly through the lower heads 35 of the cylinders and having eyemembers 31 pivotally' connected to the front lever arms 30 at 33. The upper cylinder heads 39' are pivotally connected at to to the rear leve arms 3'11, A'hydraulic pump 4! is provided for supplying liquid under pressure to the jack cylinders,

comprising an elongated cylinder 52 containing a long-stroke piston Q3. The head M of the cylinder 42 is in the form of an eye having an opening 45 for receiving one of the hooks 22 of" the truck, and the piston rod 46 of the piston projects outwardly through a cylinder head 5? and carries an eye-member 48 to which the hook or clevis of the feeding cable 8 is connectible. A flexible conduit Ell connects the pressur end of the cylinder 42 tothe pressure ends of the hydraulic jack cylinders 33, and a hand valve 5| having an operating handle 52, is provided to control the flow of liquid throughthis conduit. This valve may be closed to trap the liquid within the jack cylinders 33 to hold the machine-receiving-and-guiding frame in elevated position. When the pump cylinder is attached to the hook 22 at the forward end of the machine-receiving-and-guiding frame, in the manner shown in Figs. 1 and 2, and the hook or clevis of the feed cable 8' is connected to the eyemember 68 on the pump piston rod and the feed drum 6 is rotated to wind in the feeding cable, the pump piston 43 is moved rearwardly in its cylinder to force liquid from the pump cylinder to the jack cylinders, thereby to effect swinging of the parallel lever arms 27, 21 to elevate the the machine-receiving-and-guioling frame. When the machine-receiving-and-guiding frame is in elevated position, it may be swung about its swivel H3 horizontally over the tops of the truck wheels, so that the mining machine may be loaded and unloaded at either side of the truck. During transport of the machine about the mine, the pump 4! may be laid on suitable carrier racks 53,

i 53 arranged at one side of the truck frame, and

these carrier racks may also serve as guides for the flexible conduit 50, in the manner shown. If desired, similar carrier racks may be placed at the other side of the truck, so that the pump may be located at either side of the truck and operated by either of. the cables 8 and 9.

When the coal mining machine is being transported from place to place about the'mine, the turntable I3, its sub frame l3 and the machinereceiving-and-guiding frame l5 are in their lowered position on the truck frame, as shown in Figs. 2 and 5, with the machine-receiving-andguiding frame located downwardly between the truck wheels, so that at that time the overall height of the apparatus is maintained at a minimum; this being especially desirable when the machine is traveling through mine passages having low head room. When'the working face is reached and it is desired to unload the machine from the truck one of the feeding and controlling cables 8 and 9 may be attached to one of the hooks 22 at the forward end of the machinereceiving-and-guiding frame [5, and when the cable'is wound in by its drum the machine is moved bodily forwardly along the guideways of the machine-receiving-and-guiding frame. When the machine passes the center of gravity of the tiltable-front-portion ll of the receiving-andguiding frame, the tiltable-front-portion tilts downwardly about its pivot 18 until the front plate l9 engages the minefloor and the machine then moves bodily along the ramp provided by the tilting-front-portion and moves from the ramp onto the minefioor. During loading of the mining machine onto the transport truck, one of the feeding and controlling cables 8, 9 may be connected in one of the notches 2i in the rear plate 20, so that when the cable is wound in by its drum the machine may be drawn onto the truck. If it is desired to unload the mining machine at either side of the truck and there is sufficient head room, the pump 41 may be attached to one of the hooks 22 on the forward end of the machine-receiving-andguiding frame l5, in the manner shown in Figs. 1 and 2, and the feeding cable 8 may be attached to the eye-member 48 on the pump piston rod, the machine having previously been moved forward sufficiently to disconnect the truck drive and so enable elevation; and when the cable is wound in by its drum, liquid is forced from the pump cylinder 62 through the conduit 50, past the valve 51, to the jack cylinders 33, thereby to effect swinging of the parallel motion arms 21, 2'! to raise the machine-receiving-and-guiding frame 115. When the machine-receiving-and-guiding frame I5 is in its elevated position, the valve 5! may be closed to trap the liquid within the jack cylinders 33, and the machine-receiving-and-guiding frame may then be swung horizontally about its pivot I4 relative to the truck frame into a position at one side or the other of the truck. One of the laterallyswung positions of the machine-receiving-andguiding frame 15 is indicated in dotted lines in Fig. 1, and when the frame is in this position the mining machine may be moved bodily along the frame to either unload or load the same, in a manner similar to that above described. When it is desired to lower the machine-receiving-andguiding frame l5, this may be accomplished simply by opening the valve 5! to allow the liquid to flow from the jack cylinders 33 back to the pump cylinder 42, in an obvious manner. The pump may then be detached from the truck frame and placed on the carrier racks 53 during transport.

Should it ever be desired to elevate the frame l5 when the machine is unloaded, the pump cyla'lnder can be connected to a jack and the feed cable used to effect the necessary displacement of 1iquid. The friction of the machine on the frame i5 is enough greater to enable elevation without machine slippage, when the machine is on the truck, but damage cannot occur because if the feed drum is not stopped at the very instant maximum elevation is reached, the machine will slide forward upon the truck. If slippage of the machine were to occur instead of elevation occurring, due to any unusual condition, the tail rope can be used to hold the machine against slipping. I

As a result of this invention it will be noted that a novel mining machine transport truck is provided having improved elevating means, together with improved means for operating the elevating means. It will further be evident thatby the provision of the improved elevating mechanism for the machine-receiving-and-guiding frame, it is possible to decrease the overall height of the apparatus during transport, and to elevate the receiving-and-guiding frame to enable the latter to be swung laterally above the truck wheels into loading and unloading positions at either side of the truck. Further, by the provision of the improved hydraulic pump arrangement, together with the particular manner of operating the pump from the feeding cable of a machine feeding means, an extremely simple structure results. Other uses and advantages of the invention will be clearly apparent to those skilled in the art.

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown fOr purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is: 1. In a mining apparatus, the combination comprising a portable base having traction means, a machine-receiving-and-guiding frame mounted on said base for vertical adjustment with respect thereto, a coal mining machine of the kind having a projecting kerf cutter and flexible feeding means including a flexible feeding element attachable to an anchor in the mine for feeding the machine directly over the mine floor during the kerf cutting operation, said mining machine when the flexible feeding element is attached to said base being movable from the mine floor along said receiving-and-guiding frame onto said base, and means for elevating said vertically adjustable frame relative to said base including hydraulic jack means extending generally longitudinally of said base beneath said receiving-and-guiding frame and operatively connected between said base and said vertically adjustable frame, and a pump attachable to said base and extending longitudinally along one side thereof and operatively connectible to said flexible feeding element for actuation by the latter for supplying liquid under pressure to said jack means.

2. In a mining apparatus, the combination comprising a portable base having traction means, a machine-receiving-and-guiding frame mounted on said base for vertical adjustment with respect thereto, a coal mining machine of the kind having a projecting kerf cutter and flexible feeding means including a flexible feeding element attachable to an anchor in the mine for feeding the machine directly over the mine floor during the kerf cutting operation, said. mining machine when the flexible feeding element is attached tosaid base being movable from the mine floor along said receiving and-guiding frame onto said base, and means for elevating said vertically adjustable frame relative to said base including levers operatively connected between said base and said adjustable frame, hydraulic jack means extending generally longitudinally of said base beneath said receiving-and-guiding frame and operatively connected to said levers for swinging the latter, and a pump attachable to said base and extending longitudinally along one side thereof and operatively connected to said feeding element for actuation by the latter for supplying liquid underpressure to said jack means.

3. In a truck for the receiving, transporting and unloading of a mining machine of the type which is slidable directly on the floor of a mine during the kerf cutting operation and is fed by means of a flexible feeding element attachable to an anchor in the mine, in combination, a wheel-supported truck frame adapted to travel over the mine floor and having wheels at the opposite sides thereof whose tops extend higher than the portion of said frame which is between said wheels, a machinereceiving and-guiding frame, a horizontal frame on which said machine-receiving-and-guiding frame is supported for tilting upon an axis transverse to said machine-receiving-and-guiding frame, a fourth frame on which said horizontal frame is swivelly mounted for turning upon an upright axis, means for adjusting the height of and for supporting said fourth frame on said truck frame selectively in a position in which the structure swivelly mounted on said fourth frame, disposed lengthwise of the truck, is in a position so low that the truck wheels limit the range of horizontal swiveling of said machine-receiving-andguiding frame and in a higher position in which said machinereceiving-and-guiding frame may be caused, by

swiveling of said horizontal frame, to overlie one of truck wheels and then be inclined, by tiltins, on said transverse axis, to unload a machine there-from directly onto a mine floor along a path extending over the top of said one of said truck wheels, and means for actuating said height-adjusting and supporting means to move said fourth frame from said first mentioned position to said second mentioned position and to hold it in the latter including elements pivotally mounted for swinging movement about axes in the same straight lines with the axes of truck wheel rotation and operatively connected to said fourth frame and power operated elevating devices disposed generally longitudinally of the truck intermediate the truck wheels and beneath said machine-receiving-and-guiding frame in each of the longitudinally disposed, differently vertically adjusted positions of the latter and operatively connected to said pivotally mounted elements for swinging the latter.

4.. In a truck for the receiving, transporting and unloading of a mining machine of the type which is slidable directly on the floor of a mine during the kerf cutting operation and is fed by means of a flexible feeding element attachable to an anchor in the mine, in combination, a wheel-supported truck frame adapted to travel over the mine floor and having wheels at the opposite sides thereof whose tops extend higher than the portion of said frame which is between said wheels, a machine-receiving-and-guiding frame, a horizontal frame on which said machinereceiving-and-guiding frame is supported for tilting upon an axis transverse to said machinereceiving-and-guiding frame, a fourth frame on which said horizontal frame is swivelly mounted for turning upon an upright axis, means for adjusting the height of and for supporting said fourth frame on said truck frame selectively in a position in which the structure swivelly mounted on said fourth frame, disposed lengthwise of the truck, is in a position so low that the truck wheels limit the range of horizontal swiveling of said machine-receiving-and-guiding frame and in a higher position in which said machinereceiving--and-guiding frame may be caused, by swivelingof said horizontal frame, to overlie one of truck wheels and then be inclined, by tilting on said transverse axis, to unload a machine therefrom directly onto a mine floor along a path extending over the top of said one of said truck wheels, and means for actuating said heighaadjusting and supporting means to move said fourth frame from said first mentioned position to said second mentioned position and to hold it in the latter including elements pivotally mounted for swinging movement about axes in the same straight lines with the axes of truck wheel rotation and operatively connected to said fourth frame, power operated elevating devices d posed generally longitudinally of the truck intermediate the truck wheels and beneath said machine-receiving-and-guiding frame in each of the longitudinally disposed, differentl vertically adjusted positions of the latter and operatively connected to said pivotally mounted elements for swinging the latter and power transmitting means to which the flexible feeding element of a-mining machine in operatively connectable and.

which is operable by such a flexible element-for transmitting power to said elevating devices.

5. In a truck for the receiving, transporting and unloading of a mining machine of the type which is slidable directly on the floor of a mine during the kerf cutting operation and is fedby means of a flexible feeding element attachable to an anchor in the mine, in combination, a wheel-supported truck frame adapted to travel over the mine floor and having wheels at-the opposite sides thereof whose tops extend higher than the portion of said frame which is between said wheels, a machine-receiving-and-guiding frame, a horizontal frame on which said machine-receiving-and-guiding frame is supported for tilting upon an axis transverse to said machine-receiving-and-guiding frame, a fourth frame on which said horizontal frame is swivelly mounted for turning upon an upright axis, means for adjusting the height of and for supporting.

said fourth frame on said truck frame selectively in a position in which the structure swivelly mounted on said fourth frame, disposed lengthwise of the truck, is in a position so low that the truck wheels limit the range of horizontal swiveling of said machine-receiving-and-guiding frame and in a higher position in which said machinereceiving-and-guiding frame may be caused, by swiveling of said horizontal frame, to overlie one of said truck wheels and then be inclined, by tilting on said transverse axis, to unload a machine therefrom directly onto a mine floor along a path extending over the top of said one of said truck wheels, and means for actuating said height-adjusting and supporting means to move said fourth frame from said first mentioned position to said second mentioned position and to hold it in the latter including hydraulic jacks disposed generally longitudinally of the truck frame intermediate the truck wheels and beneath said machine-receiving-and-guiding frame in each longitudinally disposed position of the latter and a hydraulic pump attachable to the truck and to which a flexible feeding element of the feeding means for a mining machine disposed on said machine-receiving-and-guiding frame may be operatively connected and constitute an operating means to effect the transmission of fluid under pressure to said jacks.

6. In a truck for the receiving, transporting and unloading of a mining machine of the type which is slidable directly on the floor of a mine.

during the kerf cutting operation and is fedby means of a flexible feeding element attachable to an anchor in the mine, in combination, a wheelsupported truck frame adapted to travel over the mine floor and having wheels at the opposite sides thereof whose tops extend higher than the portion of said frame which is between said wheels, a machine-receiving-andguiding frame, a horizontal frame on which said machine-receivingand-guiding frame is supported for tilting upon an axis transverse to said machine-receivingand-guiding frame, a fourth frame on which said horizontal frame is swivelly mounted for turning upon an upright axis, means for adjusting the height of and for supporting said fourth frame on said truck frame selectively in a position in which the structure swivelly mounted on said fourth frame, disposed lengthwise of the truck, is in a position so low that the truck wheels limit the range of horizontal swiveling of said machinereceiving-and-guiding frame and in a higher position in which said machine-receiving-ancl-guid-.

ing frame may be caused, by swiveling of said horizontal frame, to overlie one of said truck wheels and then be inclined, by tilting on said transverse axis, to unload a machine therefrom directly onto a mine floor along a path extending over the top of said one of said truck wheels, and means for actuating said height-adjusting and supporting means to move said fourth frame from said first mentioned position to said second mentioned position and to hold it in the latter including levers pivotally mounted to turn on transverse axes in the same lines with the axes of rotation of the truck wheels and disposed intermediate the truck wheels and beneath said receiving-and-guiding frame in all longitudinally disposed positions of the latter and each pivotally connected at one end to said fourth frame and extensible power devices extending generally longitudinally of the truck also intermediate the truck wheels and beneath said receiving-and-guiding frame and operatively connected to the other ends of said levers for swinging the latter.

7. In a truck for the receiving, transporting and unloading of a mining machine of the type which is slidable directly on the floor of a mine during the kerf cutting operation and is fed by means of a flexible feeding element attachable to an anchor in the mine, in combination, a wheelsup-ported truck frame adapted to travel over the mine floor and having wheels at the opposite sides thereof whose tops extend higher than the.

portion of said frame which is between said wheels, a machine-receiving-and-guiding frame, a horizontal frame on which said machine-receiving-and-guiding frame is supported for tilting upon an axis transverse to said machine-receiving-and-guiding frame, a fourth frame on which said horizontal frame is swivelly mounted for turning upon an upright axis, means for adjusting the height of and for supporting said fourth frame on said truck frame selectively in a position in which the structure swivelly mounted on said fourth frame, disposed lengthwise of the truck, is in a position so low that the truck wheels limit the range of horizontal swiveling of said machine-receiving-and-guiding frame and in a higher position in which said machine-receiving-and-guiding frame may be caused, by swiveling of said horizontal frame, to overlie one of said truck wheels and then be inclined, by tilting on said transverse axis, to unload a machine therefrom directly onto a mine floor along a path extending over the top of said one of said truck wheels, and means for actuating said height-adjusting and supporting means to move said fourth frame from said first mentioned position to said second mentioned position and to hold it in the latter including levers pivotally mounted to turn on transverse axes in the same lines with the axes of rotation of the truck wheels and disposed intermediate the truck wheels and beneath said receiving-and-guiding frame in all longitudinally disposed positions of the latter and each pivotally connected at one end to said fourth frame, extensible power devices extending generally longitudinally of the truck also intermediate the truck wheels and beneath said receivingand-guiding frame and operatively connected to the other ends of said levers for swinging the latter and a power transmitting device connected to said truck and to which the flexible 10 feeding element of a mining machine disposed on said truck may be operatively connected whereby operation by said flexible feeding element for transmitting power medium to said extensible power devices may be effected.

8. A mining apparatus comprising, in combination, a mining machine of the kind slidable directly on the floor of a mine during the kerf cutting operation and having a projecting kerf cutter and flexible feeding means including a flexible feeding element attachable to an anchor in the mine for feeding the machine over the mine floor, and a transport truck for the machine comprising a portable base having traction means for propelling the apparatus during transport of the mining machine about the mine, said truck having a machine-receiving-and-guiding frame mounted on said base for adjustment into different elevated positions, and being tiltable on said base irrespective of its elevated position into a position wherein its outer end engages the mine fioor, said mining machine when the flexible feeding element of said feeding means is attached to the truck being slidable from the mine floor along said tilted guiding frame onto said truck base, and elevating means for said receiving-and-guiding frame including elevating devices disposed on said base beneath said frame and operatively connected to said frame, and a power device attached to said base and to which said flexible feeding element of said feeding means of the mining machine is operatively connectable and which is operatable by said flexible feeding element to supply operating power to said elevating devices to cause the latter to elevate said receiving-and-guiding frame.

9. A mining apparatus comprising, in combination, a coal mining machine of the floor type slidable directly on the floor of a mine during the kerf cutting operation and having a project ing kerf cutter and flexible feeding means including a power operated flexible feeding element attachable to an anchor in the mine for feeding the machine over the mine floor, and a transport truck for the mining machine comprising a base having traction means for propelling the apparatus about the mine during transport of the mining machine, said base having an elongated machine-receiving-and-guiding frame mounted thereon for adjustment into different elevated,

positions and tiltable relative to said base irrespective of its elevated position into a position wherein its outer end engages the mine floor so that the mining machine, when said flexible feeding element is attached to the truck, may be slid from the mine floor onto said guiding frame into transport position on the truck, and mechanism for elevating said machine-receiving-and-guiding frame relative to said base while the mining machine is supported thereon including a liquid pump attachable to the truck and to which said flexible feeding element of said feeding means of the mining machine is connectable whereby said flexible feeding means may operate the pump, and hydraulically operated elevating devices disposed on said base beneath said frame and operatively connected to the latter and to which liquid under pressure is supplied from said pump.

LEON E. SIMMONS. 

